Buggy code:
public class ComponentHelper { private Map restrictedDefinitions = new HashMap ( ) ; private ComponentHelper . AntTypeTable antTypeTable ; private final Hashtable taskClassDefinitions = new Hashtable ( ) ; private boolean rebuildTaskClassDefinitions = true ; private final Hashtable typeClassDefinitions = new Hashtable ( ) ; private boolean rebuildTypeClassDefinitions = true ; private final HashSet checkedNamespaces = new HashSet ( ) ; private Stack antLibStack = new Stack ( ) ; private String antLibCurrentUri = null ; private ComponentHelper next ; private Project project ; private static final String ERROR_NO_TASK_LIST_LOAD = "Can't<seq2seq4repair_space>load<seq2seq4repair_space>default<seq2seq4repair_space>task<seq2seq4repair_space>list" ; private static final String ERROR_NO_TYPE_LIST_LOAD = "Can't<seq2seq4repair_space>load<seq2seq4repair_space>default<seq2seq4repair_space>type<seq2seq4repair_space>list" ; public static final String COMPONENT_HELPER_REFERENCE = "ant.ComponentHelper" ; private static final String BUILD_SYSCLASSPATH_ONLY = "only" ; private static final String ANT_PROPERTY_TASK = "property" ; private static Properties [ ] defaultDefinitions = new Properties [ 2 ] ; public Project getProject ( ) { } public static ComponentHelper getComponentHelper ( Project project ) { } protected ComponentHelper ( ) { } public void setNext ( ComponentHelper next ) { } public ComponentHelper getNext ( ) { } public void setProject ( Project project ) { } private synchronized Set getCheckedNamespace ( ) { } private Map getRestrictedDefintion ( ) { Map result = new HashMap ( ) ; synchronized ( restrictedDefinitions ) { for ( Iterator i = restrictedDefinitions . entrySet ( ) . iterator ( ) ; i . hasNext ( ) ; ) { Map . Entry entry = ( ( Map . Entry ) ( i . next ( ) ) ) ; List entryVal = ( ( List ) ( entry . getValue ( ) ) ) ; synchronized ( entryVal ) { entryVal = new ArrayList ( entryVal ) ; } Object entryKey = entry . getKey ( ) ; <START_BUG> result . put ( entryKey , entryKey ) ; <END_BUG> } } return result ; } public void initSubProject ( ComponentHelper helper ) { } public Object createComponent ( UnknownElement ue , String ns , String componentType ) throws BuildException { } public Object createComponent ( String componentName ) { } public Class getComponentClass ( String componentName ) { } public AntTypeDefinition getDefinition ( String componentName ) { } public void initDefaultDefinitions ( ) { } public void addTaskDefinition ( String taskName , Class taskClass ) { } public void checkTaskClass ( final Class taskClass ) throws BuildException { } public Hashtable getTaskDefinitions ( ) { } public Hashtable getDataTypeDefinitions ( ) { } public List getRestrictedDefinitions ( String componentName ) { } public void addDataTypeDefinition ( String typeName , Class typeClass ) { } public void addDataTypeDefinition ( AntTypeDefinition def ) { } public Hashtable getAntTypeTable ( ) { } public Task createTask ( String taskType ) throws BuildException { } private Task createNewTask ( String taskType ) throws BuildException { } public Object createDataType ( String typeName ) throws BuildException { } public String getElementName ( Object element ) { } public String getElementName ( Object o , boolean brief ) { } public static String getElementName ( Project p , Object o , boolean brief ) { } private static String getUnmappedElementName ( Class c , boolean brief ) { } private boolean validDefinition ( AntTypeDefinition def ) { } private boolean sameDefinition ( AntTypeDefinition def , AntTypeDefinition old ) { } private void updateRestrictedDefinition ( AntTypeDefinition def ) { } private void updateDataTypeDefinition ( AntTypeDefinition def ) { } public void enterAntLib ( String uri ) { } public String getCurrentAntlibUri ( ) { } public void exitAntLib ( ) { } private void initTasks ( ) { } private ClassLoader getClassLoader ( ClassLoader classLoader ) { } private static synchronized Properties getDefaultDefinitions ( boolean type ) throws BuildException { } private void initTypes ( ) { } private synchronized void checkNamespace ( String componentName ) { } public String diagnoseCreationFailure ( String componentName , String type ) { } private void printUnknownDefinition ( PrintWriter out , String componentName , String dirListing ) { } private void printClassNotFound ( PrintWriter out , String classname , boolean optional , String dirListing ) { } private void printNotLoadDependentClass ( PrintWriter out , boolean optional , NoClassDefFoundError ncdfe , String dirListing ) { } private static class AntTypeTable extends Hashtable { private static final long serialVersionUID = - 3060442320477772028L ; private Project project ; AntTypeTable ( Project project ) { } AntTypeDefinition getDefinition ( String key ) { } public Object get ( Object key ) { } Object create ( String name ) { } Class getTypeClass ( String name ) { } Class getExposedClass ( String name ) { } public synchronized boolean contains ( Object clazz ) { } public boolean containsValue ( Object value ) { } public synchronized List findMatches ( String prefix ) { } } }

Fix:
result . put ( entryKey , entryVal ) ;